This is the 12th original studio album released on July 18, 1990.
This is the first time the album has been released on LP, and due to the recording time of the CD at the time of its release, it is being released on a higher-quality 45 rpm double-disc set. The album title is a combination of the English word ‘Jewel’ and the Latin word ‘Luna’ meaning “moon”. The album was co-produced by Goro Matsui, who wrote the lyrics for seven of the ten songs, and Miho Nakayama, who wrote the lyrics and three of the songs (“Kuchibiru”, “Soshite sono Natsu”, and “Tengoku he no Kagi”). The album version of the single “Megami tachi no Bouken” which was released at the same time, is included on the album, as well as “Korekara no I Love You” composed by Kenjiro Sakiya, which was released as a single version in 1991 after the album release. Other composers on the album include Hideo Saito, Kenji Hayashida, Keizo Nakanishi, and Takao Konishi, giving the album a breath of fresh air. The album opens with “Kuchibiru” written and composed by Miho Nakayama, which evokes a fresh summer breeze, followed by “Yaban na Houseki” which is connected to the album title, and “Shiroi Suna no La Mer” a song with a pleasant bossa nova touch, both of which are ambitious works. It is also an album work on the theme of summer, just as “Summer Breeze” (3rd album) and “Mind Game” (7th album) were., just as “Summer Breeze” (3rd album) and “Mind Game” (7th album) were.
